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5
RESULTS

Media Type
5
texts
Availability
5
Always Available
Topics & Subjects
4
Electric railroads
4
Street-railroads
1
Earth currents
1
Geomagnetism--Arizona--Tucson--Observations
Collection
Creator
4
american street and interurban railway association
1
carnegie institution of washington. dept. of terrestrial magnetism; rooney, w. j.
Language
5
English
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